270 MICROTINiE 



of the latter, produced as it " reached out on the dryer, more 

 open region along the edge of the prairies. . . . The extremes 

 of the form come from the furthest outlying localities." 



For external and crnnial measurements, see table at end of 

 volume. 



28e. Evotomys gapperi athabascs Preble. 



1908. Evotomys gapperi athabascw Preble, N. Amer. Fauna, No. 27, 

 p. 178; Miller, " List," 1912, p. 211; " List," 1924, p. 402. 



Type.— U.S. Nat. Mus., No. 109945; adult male, collected 

 June 27, 1901, by B. and A. Preble. 



Type locality. — Fort Smith, Slave River, Mackenzie, Canada. 



Range. — Throughout the region to the north of Great Slave 

 Lake, Canada. 



Characters. — Size as in E. g. gapperi ; with longer fur, greyer 

 face, lighter sides and under surface. 



Mantle in colour like that of the typical subspecies, but 

 ending rather abruptly a short distance in front of ears ; face 

 much clearer grey; sides greyer and less ochraceous ; lower 

 parts white and very rarely tinged with creamy. 



For external and cranial measurements, see table at end of 

 volume. 



2.S/. Evotomys gapperi galei Merriam. 



1890. Evotomys galei Merriam, N. Amer. Fauna, No. 4, p. 23. 

 1897. Evotomys gapperi galei Bailey, Proc. Biol. Soc. Washington, 

 11, p. 126; Miller, " List," 1912, p. 211; 1924, p. 402. 



Type.—\].^. Nat. Mus., No. m# ; adult female, collected 

 July 13, 1889, by D. Gale. 



Type locality. — Ward, Boulder County, Colorado. Altitude 

 9500 feet. 



Range. — Boreal zone of mountains of Colorado and north- 

 wards along eastern ranges of Rocky Mountains to Northern 

 Montana. 



Characters. — Distinguished from the typical subspecies by its 

 slightly longer tail, lighter colour, and the prominent development 

 of the superciliary ridges in old skulls. 



Mantle, in winter pelage, sharply defined, reddish-chestnut 

 with a few black hairs. Sides and face buffy grey. Belly and 

 feet whitish or yellowish-grey. Tail bicoloured, blackish or 

 bulfy grey above, whitish below, the upper side of pencil black. 

 Ears faintly tinged with chestnut. In spring and early summer the 

 mantle darkens to warm hazel, the sides to rich buffy grey. In 

 full summer pelage, the mantle is chestnut, slightly darkened with 

 black hairs ; the sides and face clearer grey than in winter ; feet 

 grey. Spot covering lateral glands in old males whitish or grey. 

 Young in August are darker than adults, with ears strongly 

 tipped with chestnut, the feet dusky and the tail not sharply 

 bicoloured. 



Skull in adults narrower than in E.g. gapperi ; interorbital region 



